WISE-CHAT · CVE-2026-128893 · Package
FIX → 3.4.6
Wise Chat's wise_chat_prepare_image_endpoint action echoes the 'data' parameter back as text/html after checking only a data:image/gif;base64 prefix. It has no nonce check. An unauthenticated attacker can run script in a chat user's browser by getting them to follow a crafted link or visit a malicious page.
first public Nov 15, 2026 · 2 sources
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Sites running the Wise Chat WordPress plugin at version 3.4.5 or earlier are exposed through reflected XSS in pages the plugin generates. The sources do not state the exact attack path or required settings. Sites without the plugin installed can skip it.
Not affected if plugin-not-installed, updated-to-3.4.6
Who cares reflected-xss, wise-chat, wordpress, wordpress-plugin, xss
3.4.5 or lower is affectedUpgrade to 3.4.6
Update Wise Chat to 3.4.6 or later (released 2026-11-13 per WPSec).
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Reflected XSS.This issue affects Wise Chat: from n/a through 3.4.5.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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